Scaling tool



Sept. 26, 1 T. M. KELLEY ETAL SCALING TOOL Filed Oct. 29, 1965 0 4 0 1 400000080 Q O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 h 0 0 0 0 0 0 0 0 0 0 00 0 00000 0 0 0%00N M 0 0 0 0000000 ww- N2 INVENTORS Om mm THOMAS M. KELLEY-BY WALTER ANDERSON DD e Q I 0 v w 00000000 0 -v w3+ 0 0 0 0 0 0 0 0 0 00 0 0 0 0 Q 0 0u0 0 00 0 0 0 0 0 0N0".u0000u% u n u n n u w u 0 0 0 0 00 0 0 0 0 0 0 %%0& u r 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 Nv wv mm mm vv Om mm ON P wN Tm mm h 3 mm ATTYS.

United States Patent 3,343,246 SCALING TOOL Thomas M. Kelley, 7403 ParkTerrace, Alexandria, Va. 22310, and Walter I. Anderson, 41 BriarwoodLane, Chesapeake, Va. 23703 Filed Oct. 29, 1965, Ser. No. 505,771 3Claims. (Cl. 29-81) ABSTRACT OF THE DISCLOSURE A scaling tool driven bya rotating electric motor having a cam drive arrangement which convertsrotary to reciprocating motion driving a needle scaling head togetherwith a bundle of needles therein which are therefore impelled intocontact with a surface to be scaled and cleaned.

The invention described herein may be manufactured and used by or forthe Government of the United States of America for governmental purposeswithout the payment of any royalties thereon or therefor.

This invention relates to needle scaling tools and more particularly toan extremely slim and compact electricallydriven needle scaling tool.

One object of the invention is to provide an electricallydriven needlescaling tool having a slim silhouette or low diameter to length ratio.

Another object of the invention is to provide acompact and light weightelectrically-driven needle scaling tool.

Another object of the invention is to provide a new and improved camdriving arrangement for an electrically-driven needle scaling tool.

The needle scaling tool contemplated by the present invention isbasically comprised of an electric motor, a reciprocating plunger, a camdrive for converting the rotational output of the motor into thereciprocatory movement of the plunger and a needle scaling head with abundle of needles therein which are adapted to be impelled by thereciprocating plunger into contact with a surface to be scaled orcleaned. The cam drive is carried within a housing which is attached toand axially aligned with the housing of the motor and includes abearing-supported barrel member which is rotatably connected to theoutput shaft of the motor and axially aligned therewith. The barrelmember carries a cam pin which rides within a continuous cam groove inthe reciprocating plunger which in turn is slidably received within anaxially extending bore within the barrel member. A needle scaling headincluding a needle housing with a spring-biased needle retainer and acluster of needles therein is detachably connected to the cam drivehousing and is adapted to receive one end of the reciprocating plunger.The needle housing carries a detachable guide sleeve for the needles andthe sleeve is axially adjustable relative to the housing; the sleeveproviding a means for holding the free ends of the needles in abundle-like assembly.

As the barrel member is rotatably driven by the motor, the cam pinriding Within the cam groove imparts reciprocatory movement to theplunger and, for each revolution of the barrel member, drives theplunger through one complete stroke axially inwardly and outwardly ofthe barrel member. As the plunger is moved outwardly on its powerstroke, it strikes the needles and impels them outwardly of the needlehousing into contact with a surface to be scaled. When the plunger isdriven inwardly by the cam drive on the return half of its stroke, thespring-biased needle retainer urges the needles inwardly of the needlehousing into a position where they will again be struck by the plungeras it moves on its power stroke outwardly of the barrel member.

The aforementioned and other objects of the invention will becomereadily apparent from the following detailed description of one specificembodiment thereof when taken in connection with the accompanyingdrawing, wherein like components are designed by like reference numeralsand wherein the sole figure thereof is a partial longitudinal sectionthrough a needle scaling tool embodying the invention, the partiallongitudinal section being divided into two parts with one of the two.parts showing a duplication or overlap of some of the components of theother.

Referring more particularly to the drawing, the scaling tool of thepresent invention is shown as including a motor housing means or motorhousing 10 which is adapted to houseor carry a suitable electrical drivemotor (not shown). The electric drive motor may be one of severalconventional types and is connected to a source of energy through themedium of a cord or the like 12 which extends from one end of the motorhousing. Motor housing 10 in this particular embodiment of the inventiontakes the form of an elongated hollow cylinder and is closed at one endby means of a plate or cap 14 and at the opposite end is reduced indiameter and is provided with peripheral threads 16 thereon. Motorhousing 10, intermediate the ends thereof, is provided with knurling onthe peripheral surface thereof, this knurled peripheral surfacefacilitating the use of the scaling tool by an operator as will bediscussed more in detail hereinafter.

A cam drive housing means or housing 20 is carried by the motor housing10 and, in this one embodiment of the invention, takes the form of anelongated hollow cylinder which is opened at both ends. One end ofhousing 20 is provided with threads 22 on the inner periphery of thehousing, and the threads 22 are adapted to be received by the threads 16on the reduced diameter portion of motor housing 10, threads 16 and 22providing a means for holding the two housings 10 and 20 in rigidassembly. The two housings 10 and 20 are threadedly connected in such amanner that the end wall 24 on housing 20 firmly abuts or engages theend wall 26 on housing 10 and the two housings, when so assembled, inelfect form one continuous or elongated housing. Both housings 10 and 20in this one embodiment of the invention are substantially identical indiameter and both are made of a suitable aluminum alloy to providehousings of light weight, the aluminum alloy thus assisting in reducingthe overall weight of the scaling tool.

Cam drive housing 20 is provided a substantially radially inwardlyextending wall 28 therein which in this particular instance is formedintegral with the body of the housing. Wall 28 has a preselectedthickness and is provided with port or aperture 30 therein which extendssubstantially axially of the housing. Port 30 is dimensioned or isprovided with a diameter such that it will slidably receive thereciprocating plunger of the scaling tool, as will also be discussedmore fully hereinafter.

A barrel shaped means or barrel member generally designated by thereference numeral 32 is rotatably supported within housing 20 andextends substantially axially thereof. Barrel member 32 is generallycylindrical in configuration and is provided with an intermediateportion 34 of enlarged diameter and, at one end, terminates in an endwall 36. Barrel member 32 is also provided with an axially extendingbore 38 therein, one end of bore 38 terminating in end wall 36 and theopposite end thereof providing the barrel member with an open end 40.Barrel member 32 in this particular instance is made of steel ratherthan an aluminum alloy although it will be apparent that it also be madeof an aluminum alloy or any other suitable material.

Barrel member 32 is rotatably supported within housing 20 on bearingmeans or bearings and, in this particular instance, the bearings takethe form of a pair of antifriction or ball bearings 42 and 44 incombination with a pair of roller thrust bearings 46 and 48. Theperiphery of barrel member 32 adjacent both of its ends is reduced indiameter to provide shaft-like ends 50 and 52 on the barrel member, andthese shaft like ends are adapted to be received within the innerperiphery of the inner races of bearings 42, 44, 46 and 48. The innerraces of the bearings are adapted to snugly fit the periphery of theshaft-like ends 50 and 52 on the barrel member, and the bearings areretained in a predetermined position within casing 20 by the structureor configuration of the barrel member itself in combination with housingwall 28, the inner periphery of the housing 20 and a lock nut 53.

Lock nut 53 is substantially cylindrical in configuration and is held orretained in a predetermined position within housing 20 by means ofthreads 54 on the periphery thereof which are adapted to be receivedwithin threads 56 on the inner periphery of the housing. Lock nut 53 inone face thereof is provided with a pair of recesses 58 therein toaccommodate the reception of a wrench or the like to facilitate thethreading of the lock nut 52 within the housing 20. Lock nut 52 isprovided with an enlarged aperture or port 60 therein and on theopposite face is counterbored at 62, the counterbore 62 providing aseating surface and shoulder for one race of the thrust bearing 48 andalso providing a means for anchoring the thrust bearing 48 in positionwithin the confines of housing 20. Shaft-like end 50 of the barrelmember terminates in an annular shoulder 64 on the barrel member whichfunctions as a seat for one race of the ball bearing 44 and, shaft-likeend 52 of the barrel member similarly terminates in an annular shoulder66 which, likewise, functions as a seat for one race of the ball bearing42. The outer peripheries of the outer races of ball bearings 42 and 44are adapted to snugly fit the inner periphery of casing 20, and it willbe appreciated that casing 20 must be dimensioned so that the ballbearings will snugly fit within the inner periphery thereof. Theinterior surface 68 of housing wall 28 affords a seat for one face ofthrust bearing 46. It will also be understood that the barrel member 32and the bearings are held in rigid assembly within housing 20 and soplaced in such rigid assembly by tightening nut 53.

The output or armature shaft 70 of the electric motor carries a spacingcollar 72 thereon which is received in port 60 in lock nut 53 and,adjacent its free end, the output shaft 70 is provided with a pair ofopposed flat surfaces 74 thereon (only one fiat surface 74 shown in thedrawing). Shaft 70 with the opposed flat surfaces there-on is adapted tobe received in a similarly shaped passage 76 formed in the end wall 36of barrel member 32. Passage 76 extends axially of the barrel member 32,and output shaft 70 is adapted to be slidably received therein. Theoutput shaft 70 with the pair of opposed flat surfaces thereon and thecorrespondingly shaped passage 76 in the barrel member thus provide anoperative and driving connection between the electric motor and therotatably supported barrel member.

A plunger means or plunger 78 is carried within the bore 38 in barrelmember 32 and is dimensioned to be slidably received therein. Plunger 78is cylindrical in shape or configuration and is reduced in diameter atpoints 80 and 82 along its length primarily to reduce the weightthereof. Plunger 78 in this particular instance is made of forged steelalthough it will be apparent that it could also be made of any othersuitable material such as an aluminum alloy. Plunger 78 terminates atone end thereof in a head portion or head 84 and, along reduced diameterportion 80, is provided with a cam groove means or cam groove 86therein. Cam groove 86 has a preselected depth 4 and a preselected pitchand takes the form of an endless or continuous groove formed in the bodyof the plunger.

Barrel member 32 carries a cam follower means or cam follower which isadapted to ride or be received within the continuous cam groove 86. Thecam follower in this one specific embodiment of the invention takes theform of a cam pin 88 which is carried in a passage 90 in theintermediate portion 34 of barrel 32. Cam pin 88 is provided with athreaded head 92 thereon and the head 92 is adapted to be receivedwithin a counterbore 94 within barrel passage 90. The threads on head 92are adapted to be received within threads (not shown) in counterbore 94,and this threaded connection firmly retains the cam pin 88 within barrelpassage 90. Cam pin 88 is also provided with a slot 96 in the head 92thereof to accommodate the use of a screwdriver or the like when the campin is being threadedly connected to the barrel member.

Cam pin 88 riding within the continuous cam groove 86 provides a meansfor converting the rotary motion of the electric motor into thereciprocating movement of the plunger 78. It will be understood thateach revolution of the barrel member 32 will produce one complete strokeof the plunger 78 with the plunger moving axially outwardly and inwardlyof bore 38 in the barrel member. It will also be understood that cam pin88 will continuously drive the plunger 78 through its reciprocatingmovement and will thus move the plunger both axially inwardly of bore 38(to the right as shown in the drawing) and axially outwardly of bore 38(to the left as shownvin the drawing). In the drawing, the plunger 78 isshown at the extreme inner end of its stroke and is thus in a fullyretracted position. Upon rotation of the barrel member 32, however, theplunger will be moved axially to the left as shown in the drawing and,when the barrel member rotates through one half of a revolution, theplunger will have moved to its extreme extended position and will havethus moved through its power stroke. When the plunger 78 reaches itsfully extended position, the continued rotation of the barrel member 32through the other half of the revolution will again move the plunger 78back to its fully retracted position. Thus, as the barrel member 32rotates, the plunger 78 will be constantly and continuously reciprocatedaxially outwardly and inwardly of the barrel member between fullyextended and fully retracted positions. The length of stroke of theplunger 78 will, of course, be determined by the pitch of the cam groove86. The cam groove 86 in this one specific embodiment of the inventionhas a pitch such that one complete revolution of the barrel member 32produces a length of stroke of the plunger of one quart r of an inch.

Cam drive housing 20 carries a needle scaling head generally indicatedby the reference number 98. Needle scaling head is comprised of ahousing means or housing 100 which in this one specific embodiment ofthe invention assumes the form of an elongated hollow cylinder which isopened at both ends. Housing 100 is provided with a peripheral flange102 thereon adjacent one end thereof (the right end as shown in thedrawing), and this end of the housing 100 is adapted to be slidablyreceived within the open end of cam drive housing 20. Housing 100 isrigidly connected to housing 20 by means of a collar 104, the collar 104being provided with internal threads 106 thereon which are adapted to bereceived within threads 108 on the periphery of housing 20. Collar 104provides a rigid connection between cam drive housing 20 and needlehousing 100, and, when the two housings are in assembly, flange 102 isadapted to abut the end wall of cam drive housing 20. Peripheral flange102 is carried in a predetermined position on needle housing 100 and, inbeing so positioned, limits the depth of insertion of housing 100 intothe open end of cam drive housing 20. It will also be noted in thedrawing that peripheral flange 102 is formed integrally with the body ofneedle housing 100 in this particular instance. Needle housing 100 inthis one specific embodiment of the invention is made of steel, as isthe collar 104, although it will be appreciated that both of thesecomponents could just as readily be made of any other suitable materialsuch as an aluminum alloy.

A needle retainer means or needle retainer 110 is slidably carriedwithin needle housing 100 and in this particular instance assumes theform of an annular, substantially cup-shaped member having a side wall112 and a bottom wall 114. Bottom wall 114 is provided with a pluralityof spaced, axially extending passages 116 therein, and each passage 116.is adapted to slidably receive and retain therein a needle means orneedle 118. Each needle 118 is provided with a substantiallyfrusto-eonically shaped head 120 thereon and each such head is adaptedto be received or seated within a similarly shaped recess 122 in oneface of needle retainer bottom wall 114, each recess 122 of course beingaxially aligned or symmetrically positioned with respect to one of thepassages 116 in the needle retainer bottom wall. Needles 118 are made ofa hard and flexible steel and, in use, must be capable of flexing orbending without being subject to breakage.

Needle housing 100 carries a resilient means therein and, in thisparticular embodiment of the invention, such resilient means assumes theform of a compression spring 124. One end of compression spring 124 isreceived within side wall 112 of needle retainer 110 and is adapted toseat on the bottom wall 114 of the needle retainer. The opposite end ofspring 124 is adapted to seat on an inturned fiange 126 on the end ofthe needle housing 100. It will be noted in the drawing that spring 124has a diameter such that the needles 118, extending axially of andbeyond the needle housing 100, are carried or positioned within thespring. It will also be noted in the drawing that spring 124 willconstantly urge the needle retainer 110 and the plurality of needles 118carried thereby toward engagement with the head 84 on plunger 78. In thefully retracted position of the plunger 78 as shown in the drawing, thespring 124 will of course bias the needle retainer axially of housing100 into engagement with plunger head 84.

A guide means or guide 128 is carried by housing 100 and, in thisparticular instance, takes the form of an elongated substantiallycylindrical sleeve. The end of sleeve 128 that is positioned on housing100 is split or is provided with a longitudinally extending slot 130therein and, on both sides of slot 130, carries or is provided with apair of upstanding ears or tabs 132 (only one shown). Each ear 132 isprovided with a hole or port 134 therein, the two holes 134 providing apassageway for a bolt or the like (not shown). The bolt is adapted tocarry a nut (not shown) which when tightened on the bolt provides ameans for rigidly connecting or clamping the guide sleeve 128 to thecasing 100. The opposite end of guide sleeve 128 is converged or turnedinwardly at 136 to provide a constricted open end 138 on the guidesleeve, the constricted open end 138 in this particular instanceassuming a substantially rectangular shape or configuration (not shown).Open end 138 is constricted into the substan: tially rectangularly shapein order that the ends 140 of the needles projecting beyond the end ofthe guide sleeve may be retained in a bundle-like or cluster-likeassembly so that they may be eifectively directed at a surface to bescaled or cleaned. Since guide sleeve 128 is clamped on housing 100, theposition thereof on housing 100 may be selectively varied. The guidesleeve is preferably clamped on the housing in such a position that theend 138 thereof is positioned approximately an inch and a half from thefree or working ends 140 of the needles. Guide sleeve 128 is carried ona reduced diameter portion 142 of housing 100 and, when moved to itsextreme retracted position on housing 100, is adapted to abut a shoulder144 formed on the periphery of housing 100, the shoulder 144 thusserving as a stop to limit the axial movement of the guide sleeve on thehousing.

Rotation of plunger 78 within the bore 38 of the barrel member isprevented by means of a pin means or pin 146 which is slidably carriedwithin a longitudinally extending peripheral groove or recess 148 formedin the periphery of the plunger. Pin 146 is carried within a passage 150in the wall of housing and is retained within housing passage by meansof a set screw or the like 152. Set screw 152 is in turn carried withina threaded passage 154 in cam drive housing 20, the two housing passages150 and 154 of course being aligned. Set screw 152 is provided with theusual slot 156 therein to accommodate the reception of a tool such as ascrew driver or the like.

Means is provided to permit the introduction of a lubricant into camgroove 86 and, in this one embodiment of the invention, this means takesthe form of a passage 158 in barrel member intermediate portion 34.Passage 158 communicates with a counterbore 160 in barrel memberintermediate portion 34 and counterbore 160 is threaded (not shown) andis adapted to be sealed by a threaded plug 162. Barrel member passage158 and counterbore 160. are adapted to communicate with a port 164 incam drive housing 20, which port is likewise threaded (not shown) and isadapted to be sealed by a threaded plug 166. Threaded plugs 162 and 166are both provided with the usual slots in the heads thereof to permit asuitable tool such as a screw driver to be applied thereto.

Adjacent to cam groove 86, plunger 78 is provided with a pair ofperipheral recesses or grooves 168 and 170 therein and the grooves areadapted to seat a pair of O-ring seals 172 and 174, respectively. TheO-ring seals 172 and 174 in function serve to retain the lubricant inbarrel member bore 38 in close proximity to the cam groove 86 and campin 88 and thus insure that the groove and pin will be constantlylubricated.

To assemble the scaling tool of the present invention, plunger 78 withthe two O-ring seals 172 and 174 thereon is first inserted into axialbore 38 in barrel member 32. Cam pin 88 is then threadedly connected tobarrel member 32 in such a manner that the pin is received in cam groove86. The bearings 42, 44, 46 and 48 are then placed upon the shaft-likeends 58 and 52 of the barrel member, and then the assembly comprised ofthe barrel member, the plunger and the bearings is inserted as a unitinto cam drive housing 20. Lock nut 53 is then threaded into cam drivehousing 20 and tightened therein into a position until all of thecomponents of the assembly are rigidly retained within the cam drivehousing. The cam drive housing is then threaded or turned onto the motorhousing 10 with the flattened armature shaft 74 of the motor beingreceived within the axially extending passage 76 in the end wall 36 ofthe barrel member. Needle housing 100 with the needle retainer, needlesand spring therein is then inserted into the open end of cam drivehousing 28 and pin 146 is then inserted into needle housing passage 150to prevent the rotation of barrel member 78. Threaded plug 152 is theninserted into cam drive housing passage 154. Collar 104 is then appliedto the threaded portion 108 of cam drive housing 20 to rigidly connectthe needle scaling head to the cam drive housing. With the guide sleeve128 being clamped on housing 100 in a pre-selected position the needlescaling tool is now ready for use or operation.

In using the scaling tool, the operator first grasps the knurled portion18 of the motor housing with one hand and the periphery of needleretainer housing 100 with the other. As power is supplied to theelectric motor of the tool, the barrel member 32 Will rotate and,through the medium of the cam pin 88 and cam groove 86, Will impartreciprocatory movement to the plunger 78. As barrel member 32 movesthrough one half of a revolution, the cam pin 88 and cam groove 86 willmove the plunger axially outwardly of the barrel member and will thusmove the plunger through the power half of its stroke. As the barrelrotates the remaining half of the revolution, the cam pin and groovewill move the plunger axially 7 inwardly of the barrel member and willthus move the plunger through the retraction half of its stroke. Theplunger 78 will thus be constantly and continuously driven by the motorand in both directions of travel.

On the power half of each stroke, the head 84 of the plunger will strikethe needle retainer 110 and the needle heads 120 a sharp blow and willdrive the needle retainer and needles axially outwardly of the housing100 into contact with a surface to be scaled. On the return half of eachstroke, the spring 124 will urge the retainer and needles axiallyinwardly of the housing 100 and will move them into a position wherethey can again be struck by the plunger head 84 on the next power halfof the stroke of the plunger. Thus, acting under the influence of theplunger 78 and the spring 124, the needles 118 will be cyclically andrepeatedly impelled and moved axially outwardly and inwardly of thehousing 100 into contact with a surface to be sealed.

The free or working ends 140 of the needles will repeatedly strike thesurface to be cleaned with a series of sharp blows. These sharp blowswill loosen or dislodge the material from such surface, and the needleswill at the same time undergo a lateral whipping action which willremove the material from such surface. When pressure is applied to theneedles by the operator of the tool or, in other words, when the needlesare pushed into engagement with a surface to be scaled, the needles willflex or bow upon striking such surface, as illustrated in dotted linesin the drawing within the guide sleeve 128.

As the needles 118 become shortened or worn away in use, the position ofthe guide sleeve 128 on housing 100 can be selectively varied tomaintain the desired spacing between the ends 138 of the guide sleeveand the working ends of the needles. When the needles 118 become tooshort for use, they of course must be replaced and this can readily bedone by merely removing the housing 100 from the cam drive housing 20which provides ready access to the interior of needle retainer housing100.

The present invention provides a compact and light weight scaling tooland one having a slim silhouette, all of which is mainly due to thefewer number of components employed in the tool as compared to prior artdevices and the axial arrangement of substantially all of the componentsthereof. The axial arrangement of the components, especially thosewithin the cam drive housing 20, permits the components to be made assmall as possible and thus enables the components to be carried orpackaged within housings having small diameters compared to theirlengths. Scaling tools incorporating the present invention have beenconstructed and successfully used wherein one inch ball bearings havebeen employed to rota'tably support the barrel member thereof. Needlessto say the tool could be even further miniaturized without anydifficulty and without interfering in any way with the successfuloperation thereof.

Having thus described one specific embodiment of the invention, it willbe appreciated and understood that numerous other structuralmodifications and adaptations may be resorted to without departing fromthe scope of the invention as defined by the appended claims.

What is claimed is:

1. A needle scaling tool comprising:

electric motor means;

first housing means connected to said electric motor means and extendingaxially thereof;

barrel means rotatably supported within said housing means in axialalignment therewith and being driven by said motor means; plunger meansslidably and axially received within said barrel means and having camgroove means therein;

cam follower means carried by said barrel means and being receivablewithin said cam groove means in said plunger means;

second housing means detachably connected to said first housing meansand extending axially thereof;

one end of said plunger means being slidably received within said secondhousing means;

needle retainer means slidably carried within said second housing means;

needle means slidably carried by said needle retainer means andextending axially outwardly of said second housing means; and

resilient means carried within said second housing means constantlyurging said retainer means and said needle means toward engagement withsaid one end of said plunger means;

said cam follower means being operable upon rotation of said barrelmeans to impart reciprocatory movement to said plunger means to therebycyclically and repeatedly impel said needle means outwardly of saidsecond housing means into contact with a surface to be scaled;

wherein said needle retainer means is substantially cupshaped inconfiguration and is provided with a plurality of passages in the bottomWall thereof;

said needle means takes the form of a plurality of elongated andflexible needles, one of which is slidably received in each passage insaid bottom wall of said retainer means;

said needles having heads thereon adapted to seat in countersunkportions in one face of said bottom wall of said needle retainer means;

said resilient means carried within said second housing means takes theform of a compression spring;

one end of said compression spring being seated on the opposite face ofsaid bottom wall of said cupshaped needle retainer means and theopposite end of said compression spring being seated on an inturnedflange on the opposite end of said second housing means.

2. A needle scaling tool comprising:

electric motor means;

first housing means connected to said electric motor means and extendingaxially thereof;

barrel means rotatably supported within said housing means in axialalignment therewith and being driven by said motor means;

plunger means slidably and axially received within said barrel means andhaving cam groove means therein;

cam follower means carried by said barrel means and :being receivablewithin said cam groove means in said plunger means;

second housing means detachably connected to said first housing meansand extending axially thereof;

one end of said plunger means being slidably received within said secondhousing means;

needle retainer means slidably carried Within said second housing means;

needle means slidably carried by said needle retainer means andextending axially outwardly of said second housing means; and

resilient means carried within said second housing means constantlyurging said retainer means and said needle means toward engagement withsaid one end of said plunger means;

said cam follower means being operable upon rotation of said barrelmeans to impart reciprocatory movement to said plunger means to therebycyclically and repeatedly impel said needle means outwardly of saidsecond housing means into contact with a surface to be scaled;

wherein said plunger means carries peripheral lubricant seals therein onopposite sides of said cam groove means; and

wherein said barrel means and said first housing means have sealablelubricant passages therein for the introduction of a lubricant into saidcam groove means.

3. A needle scaling tool as claimed in claim 2 wherein said motor meansincludes an output shaft the end portion of which has a pair of opposedflat surfaces thereon;

the end portion of said output shaft being slidably received within acorrespondingly shaped axially extending passage in one end wall of saidbarrel means;

said pair of opposed flat surfaces on said end portion of said outputshaft and said correspondingly shaped passage in said end wall of saidbarrel means providing a driving connection between said motor means andsaid barrel means.

References Cited UNITED STATES PATENTS 2,490,449 12/1949 Lynch 7457 102,672,677 3/1954 Von Arx 29-81 2,677,885 5/1954 Chaun 15 23 X 3,150,8889/1964 Parker 29--81 X OTHER REFERENCES German application, 1,027,039,March 1958.

10 WALTER A. SCHEEL, Primary Examiner.

I. M. NEARY, Assistant Examiner.

1. A NEEDLE SCALING TOOL COMPRISING: ELECTRIC MOTOR MEANS; FIRST HOUSINGMEANS CONNECTED TO SAID ELECTRIC MOTOR MEANS AND EXTENDING AXIALLYTHEREOF; BARREL MEANS ROTATABLY SUPPORTED WITHIN SAID HOUSING MEANS INAXIAL ALIGNMENT THEREWITH AND BEING DRIVEN BY SAID MOTOR MEANS; PLUNGERMEANS SLIDABLY AND AXIALLY RECEIVED WITHIN SAID BARREL MEANS AND HAVINGCAM GROOVE MEANS THEREIN; CAM FOLLOWER MEANS CARRIED BY SAID BARRELMEANS AND BEING RECEIVABLE WITHIN SAID CAM GROOVE MEANS IN SAID PLUNGERMEANS; SECOND HOUSING MEANS DETACHABLY CONNECTED TO SAID FIRST HOUSINGMEANS AND EXTENDING AXIALLY THEREOF; ONE END OF SAID PLUNGER MEANS BEINGSLIDABLY RECEIVED WITHIN SAID SECOND HOUSING MEANS; NEEDLE RETAINERMEANS SLIDABLY CARRIED WITHIN SAID SECOND HOUSING MEANS; NEEDLE MEANSSLIDABLY CARRIED BY SAID NEEDLE RETAINER MEANS AND EXTENDING AXIALLYOUTWARDLY OF SAID SECOND HOUSING MEANS; AND NEEDLE MEANS SLIDABLYCARRIED BY SAID NEEDLE RETAINER MEANS CONSTANTLY URGING SAID RETAINERMEANS AND SAID NEEDLE MEANS TOWARD ENGAGEMENT WITH SAID ONE END OF SAIDPLUNGER MEANS; SAID CAM FOLLOWER MEANS BEING OPERABLE UPON ROTATION OFSAID BARREL MEANS TO IMPART RECIPROCATORY MOVEMENT TO SAID PLUNGER MEANSTO THEREBY CYCLICALLY AND REPEATEDLY IMPEL SAID NEEDLE MEANS OUTWARDLYOF SAID SECOND HOUSING MEANS INTO CONTACT WITH A SURFACE TO BE SCALED;WHEREIN SAID NEEDLE RETAINER MEANS IN SUBSTANTIALLY CUPSHAPED INCONFIGURATION AND IS PROVIDED WITH A PLURALITY OF PASSAGES IN THE BOTTOMWALL THEREOF; SAID NEEDLE MEANS TAKES THE FORM OF A PLURALITY OFELONGATED AND FLEXIBLE NEEDLES, ONE OF WHICH IS SLIDABLY RECEIVED INEACH PASSAGE IN SAID BOTTOM WALL OF SAID RETAINER MEANS; SAID NEEDLESHAVING HEADS THEREON ADAPTED TO SEAT IN COUNTERSUNK PORTIONS IN ONE FACEOF SAID BOTTOM WALL OF SAID NEEDLE RETAINER MEANS; SAID RESILIENT MEANSCARRIED WITHIN SAID SECOND HOUSING MEANS TAKES THE FORM OF A COMPRESSIONSPRING; ONE END OF SAID COMPRESSION SPRING BEING SEATED ON THE OPPOSITEFACE OF SAID BOTTOM WALL OF SAID CUPSHAPED NEEDLE RETAINER MEANS AND THEOPPOSITE END OF SAID COMPRESSION SPRING BEING SEATED ON AN INTURNEDFLANGE ON THE OPPOSITE END OF SAID SECOND HOUSING MEANS.